It is urgent that I get-away from the 13th of Oct (5-6 nights)
Baden Baden is a well known spa town about 3 hours from Zurich. But the closest Marriott would be Karlsrule I believe, about 45 minutes away. Loved BB!
The Ren in Lucerne is a favorite of mine but I don't know of any spas. There probably are but they just aren't my thing.